INFICON MDC-370 Thin Film Deposition Controller - Manual (Page 105)

MDC-370 DEPOSITION CONTROLLER
In this implementation, pin 7 ‘CTS’ means what is says, namely, this is an output
control line, and when the MDC-370 asserts this control line ‘true’ the host can
transmit to the MDC-370. On the other hand, pin 8 ‘RTS’ is not quite what it
may seem because this is a signal input to the MDC-370, and it is intended that
the host should assert this line ‘true’ only when the MDC-370 is allowed to
transmit data to the host. The MDC-370 does not generate an RTS ‘request-to-
send’ as such for the host PC, so the host should assert pin 8 true whenever the
MDC-370 is allowed to transmit to the host, without being asked to do so.
8.3.7 DISCRETE INPUT/OUTPUT
The MDC-370 has two types of I/O cards available. The Passive I/O card, PN#
179206, has TTL level (0 to 5 volt DC) inputs. The Passive inputs are pulled up
to 5 volts internally through a 4.7 K OHM resister and are set true, assuming the
input’s True level is set to Low, by shorting the input pins together. The Active
I/O card, PN# 179239, has 12 to 120 volt AC/DC inputs. The Active inputs are
set true, assuming the input’s true level is set to High, by supplying 12 to 120 volt
AC or DC across the input pins.
Both cards have the same relay output scheme and use the same D37P connector.
The only difference is the Active I/O card’s connector is keyed such that it cannot
be inserted into the Passive I/O card’s connector.
There are two I/O card slots in the MDC-370 and they function identically. Either
card type can be inserted into either I/O slot. The vacuum system side of the I/O
cards requires a socket connector with receptacle crimp pins equivalent to AMP
205562-2. Figure 8-6 shows the pin configuration and Table 8-4 supplies pin
signal assignments for both types of cards. Refer to Section 4.3.3.2 and 4.3.3.3
for I/O programming instructions.
8.3.8 DIGITAL-TO-ANALOG CONVERTER (DAC)
The Digital-to-Analog Converters are interfaced via a 7-pin, circular mini DIN
connector. The vacuum system side of the interface requires a connector
equivalent to the CINCH MDX-7PI. Figure 8-3 shows the connector and Table 8-
1 shows the signal assignments.
CONTROLLER INSTALLATION 8-3